Final answer:
The labor requirements of a hybrid event in union facilities may change if it is opened to the public.
Step-by-step explanation:
The labor requirements of a hybrid event may change in union facilities if the event is opened to the public. In union facilities, there may be specific rules and agreements in place that dictate the hiring and employment of workers for events. These rules could include provisions for unionized workers to be given priority for event staffing. If the event is opened to the public, it may require additional staffing and resources to handle the increased attendance, which could impact labor requirements.